veloren/common/src/comp/states/roll.rs

use crate::comp::{
    ActionState::*, DodgeKind::*, EcsStateData, ItemKind::Tool, StateHandler, StateUpdate, ToolData,
};
use crate::util::state_utils::*;
use std::time::Duration;
use vek::Vec3;

const ROLL_SPEED: f32 = 17.0;

#[derive(Clone, Copy, Default, Debug, PartialEq, Serialize, Deserialize, Eq, Hash)]
pub struct RollState {
    /// How long the state has until exitting
    remaining_duration: Duration,
}

impl StateHandler for RollState {
    fn new(ecs_data: &EcsStateData) -> Self {
        let tool_data =
            if let Some(Tool(data)) = ecs_data.stats.equipment.main.as_ref().map(|i| i.kind) {
                data
            } else {
                ToolData::default()
            };
        Self {
            remaining_duration: tool_data.attack_duration(),
        }
    }

    fn handle(&self, ecs_data: &EcsStateData) -> StateUpdate {
        let mut update = StateUpdate {
            character: *ecs_data.character,
            pos: *ecs_data.pos,
            vel: *ecs_data.vel,
            ori: *ecs_data.ori,
        };

        // Update velocity
        update.vel.0 = Vec3::new(0.0, 0.0, update.vel.0.z)
            + (update.vel.0 * Vec3::new(1.0, 1.0, 0.0)
                + 1.5
                    * ecs_data
                        .inputs
                        .move_dir
                        .try_normalized()
                        .unwrap_or_default())
            .try_normalized()
            .unwrap_or_default()
                * ROLL_SPEED;

        // Check if roll duration has expired
        if self.remaining_duration == Duration::default() {
            // If so, go back to wielding or idling
            update.character.action_state = attempt_wield(ecs_data.stats);
            return update;
        }

        // Otherwise, tick down remaining_duration
        update.character.action_state = Dodge(Roll(Some(RollState {
            remaining_duration: self
                .remaining_duration
                .checked_sub(Duration::from_secs_f32(ecs_data.dt.0))
                .unwrap_or_default(),
        })));

        // Keep rolling
        return update;
    }
}